Transanal excision of a malignant fibrous histiocytoma of anal canal: A case report and literature review

Figure 1 On colonoscopy, an ulcerated fungating mass was detected 3 cm from the anal verge.

Figure 2 Magnetic resonance imaging shows a T1-weighted of low signal area (arrow) growing in the anterior portion of the anorectal junction.

Figure 3 Histological section shows a typical malignant fibrous histiocytoma featuring spindle cells arranged in a storiform pattern (HE, × 400).

Figure 4 Tumor cells show positive immunostaining for CD68 (× 400).